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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a443501db4bf51600c2cdfcb8710ee6a0f6bfa15f60161be5fa3a1ca791e4fba' 
  AND token = 'QCK7/9s9H0X0xEqkyFeRMgvMz7CFuSMOAE32I2YdejU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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