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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3669403a2a01df00000392bf6bcffbf68acc024916cd08a09f52fa25256a265f' 
  AND token = 'VX3+uh3lBA6X0D50a0Zsr+f2Lq/vfnGnbJqMC14Wkvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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