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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361bc45eff1159310a34786a79f1e815517f4231d6d5b877fca75439b0681555' 
  AND token = 'HiL9AnRZZnz3I3CfPpj0X0IaR33bpSea2mitKKsS7x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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