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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fff0c376c64b8a1294f32e4ead619ac55f74925e61f419ed9b2afcc668a2e2' 
  AND token = 'Egd9IFLLySa0bw4w4HNXpZGDEvPmoQK/Jk9/2Uy+7q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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