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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f007e2ec9ba3a0a1057554602e1ba3d79ce28dbcc08bd03547ac28af048aa695' 
  AND token = '4VyQshsA22k/niMAXuTGX3+dD7F7Vz/rq+K60J9l+1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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