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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7b1d75d9d8cacb902096d7af4ac2cf0c1c773cca86d25d778796a171516458' 
  AND token = 'B4vSi29WHsX43dgTftVZaOA+vnSIghElfAm74S7fY1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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