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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db425c27e76460302e1403d3dfdd6baa15dd8e3b82099d990d00c64d9a583c76' 
  AND token = 'lz0IFO0G1p8eJZuwGUJvNK8zABI60fsGQMyNw6YFm3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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