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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ff4ba6ee8d3d87ab042571fd4dd32d2821a1f27a82e23982232eddd640e1c1' 
  AND token = 'JLCWMRiXSGo8RL3NCNwtyw/tM9uo40Cr2t/1mfoTBso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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