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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c669dab830cff6423e5215e1a35dad3179b2a0f07f11391754e5c68a6317a89d' 
  AND token = 'JNkR+4Ca9glwoDewIyPfRV/sigOP+kndNbBGfInyBvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}