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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a229b163cea3f20758d6fb8fa9a4c2c5ea506c02cfdb358662432bd9a7a401' 
  AND token = 'n2vZR7sbNYFRJlx0Eula31uthDXpMY3J/8HCK+6j4DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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