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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09631b4ef0d00d0f88acbbbfd891390d95145e5c5c2a9e6831314d9c4b95f9e1' 
  AND token = 'fX80WyiZqZ11wBEytUSC6nFah6D5tZzMfYl4KH7UXb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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