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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '121584265f5118ef22d6a41971d23eaa4c1de859446f670f03865b0140effc89' 
  AND token = 'qWajPSB33j2Kxk+GdM//kFrkHeUsyXPFmbc+l3+/qg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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