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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada6229b83b98893a47045f2b4972f2b3ea8d0100c0703ba7aedad13f6662c08' 
  AND token = 'EQb09ZZvOcMKJUzQkkuK1iAnU9WI6Nsz1UPZ+21kEeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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