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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1153b1146fa2f39235eac3e6f027fca4b161d80f12f1621ad74132c67c1fccab' 
  AND token = 'fEN+MkeqNcpCLAoHpfDz2oXJG6RCjjbNMkoiqkwrrnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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