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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9cd740782405856531cb06e53a733f47f4c66a77e04df9f2045de757a7b93d' 
  AND token = 'cbnkAMDp5Jl/NKGp71HmulV2XOTDNtYbCtI/3n/H/rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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