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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9366255c46cd0f202bec31a67534e4a6f0e5a122e3d06901b809b0b64dbc93' 
  AND token = '+l1wV3DhcVHzMFlc12p/aqNAkvdblM7/PZPNMTMg/fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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