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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77602afd8a0c2c8191d949d1c333f1d0b7f1ce841c36ff13cddc73dad7b3e6a8' 
  AND token = 'VkFOZAn7jXoGrj6aIVrmcP7H+FKZ+so+PMzps+qaqvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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