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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4f3cf6a565e379043f5e66ba73148c7854de1c7df53b138ae1412bf92f0130' 
  AND token = 'l3aQDcCWdeuVV6fjgjEcciaj4/1g+iMjty42cXNiioE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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