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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11fe4223ae37072429c01eadd9c833c554836a0c65c6100398f2400dc32f748' 
  AND token = 'PiMbaCaRSVfy7QSRJPpv+v5t2t+/d+1DDDd4b17c6uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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