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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f589f1e65956ea5188af85a7a3667c5656dc13fcc0c96b27a164af47e33c90e1' 
  AND token = 'NxHPKaH+y9F1OPO/akOqVUTBru1PtGgNBr014dS6fcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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