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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d188d46879f9a34e06cb57777afa8a96fbe4c5100d4f0d85b12557fcb6671a3' 
  AND token = 'aKo3dBl0h7GCKt5NGdQJEBSil1TC2pzywd3Y/KI63ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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