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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74206d4717ff10cb860472e476ac3ac3de753f290108a8f06e34565063b27bb4' 
  AND token = 'EQAdfWjM1Jd/mduGhn2Om4fhm/bVtaarN5i7asLePko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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