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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7338d1b1d4725f5058945821907a65270a3efc8be28bf2c9263e47225ae7c2a9' 
  AND token = 'araovraqEBn1SVG88m+JyNt/h9UZ597SSnUSAtRdomg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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