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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6857c2aca58532fea0feb1ea413654cd3f9dc40cec8055250ad35e0e7911fd' 
  AND token = 'QSM1v6LDqq3L1Hq6yM/oGSuVQJsg96ugYzMWT15evm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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