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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201bed028c354fcd134a52aea79430f0b56699532aedafe8d28d8d5a3e0da47a' 
  AND token = 'fXYGEo5YKWYf2j4Uf0Ptv/t8zmxht8LZ7uLaymG3ngM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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