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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca82e14328c1646f8020eadef081bec59d30039349def93a64ce5afd5e77dff' 
  AND token = 'IAvrLudpJU8QO01g4poHN8mnO2a6o0Rn6BomtF/REd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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