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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e57e260f73656fb8f337825d863f958dcc9f63e4725f6f985f3cf84bb51b2f12' 
  AND token = 'WtX7vIAiadEc4XPCsbFNzwOdXAMRLZ3LzkQiimXKowY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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