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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd95da74b06c47364a42b983832d2c0fa48a81600554e008a55dec481546172d' 
  AND token = 'OPLgXyOL5jyVz0fbALZRwndvfDIi/jcqVRSJVid+Eog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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