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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932b4fb3b5c21decede6831287fe1d1f2ac21b33f600d50b514589b151c6443d' 
  AND token = 'jOt/79P12WZWY4M68GAJgMS5ISYDHSfs9aC0Ab4Ed3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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