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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b90386acaf965c6a6ad7049f0cb6e1d0331d3ccb6d0052a67882b1a660f62fd' 
  AND token = 'Odr+pbpfCY8zl5e+T5Kz1WxNwr1zelZdmxEC39m5ilc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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